Defects4J (Version 2.0.0) [1]} is a collection of 17 programs and 835 faulty program versions containing a wide spectrum of real software faults. The number of subject programs and the total number of faulty program versions have nearly doubled in this release of Defects4J. Although the very low failure rates of many Defects4J programs make them non-ideal for statistical fault localization[2]}, its user friendly scripts and continuous support and evolution makes it an invaluable source for empirical studies.
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